fix: bug when nesting non-existing relations

Author: ProGM

lib/auto_preload/resolver.rb

@@ -95,8 +95,12 @@ def split_inclusions(model, inclusions, root: false)
 
       head, *tail = inclusions.split(".", 2)
       head = head.strip.underscore.to_sym
-      child_model = find_association(model, head, root: root).klass
-      [{ head => resolve(child_model, tail[0]) }]
+      child_model = find_association(model, head, root: root)&.klass
+      if child_model.nil?
+        []
+      else
+        [{ head =>  resolve(child_model, tail[0]) }]
+      end
     end
 
     # @param model [ActiveRecord::Base]

spec/auto_preload/serializer_spec.rb

@@ -18,6 +18,10 @@
       expect(subject.resolve(Comment, "user,article")).to eq [:user]
     end
 
+    it "skips not defined associations in the serializer when it's nested" do
+      expect(subject.resolve(Comment, "user.something.something.something,article")).to eq([{ user: [] }])
+    end
+
     it "prevents loops" do
       expect(subject.resolve(Comment, "**")).to eq [:user]
     end